Granted Patent
Utility
US 4,012,072 · App. 05/650,568
Flexing multi-firmness seat cover
Inventor:
Leif Hansen
Patented Case
View Patent ↗
Granted: Mar 15, 1977
Filed: Jan 19, 1976
Inventor
Leif Hansen
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.